Abstract
Photocatalysts based on Ti-HMS were prepared using different Ti sources. Ti organic sources (isopropoxide, butoxide and ammonium oxalate) and TiO2 bulk (P25) were introduced during the synthesis of hexagonal mesoporous silica (HMS) and compared to the pure TiO2-P25 bulk in water splitting reaction using UV radiation. The Ti-HMS photocatalysts were characterized by N2 physisorption, thermogravimetry, X-ray diffraction, infrared spectroscopy, diffuse reflectance spectroscopy and transmission electron microscopy. All Ti-HMS samples presented higher H2 production than pure TiO2 bulk no supported. Ti-HMS samples prepared from Ti organic source showed to be more photoactive in water splitting reaction. Ti(VI) isopropoxide as Ti source showed the highest photoactivity because of higher concentration of isolated tetrahedrally coordinated Ti-oxide species spread at the surface walls of the silica channels. These photoactive sites were considered the main active sites in water splitting reaction. However, isolated octahedral coordinated Ti species showed also a role as active sites in water splitting.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.